First of all, Powers of Attorney terminate when the principal dies. The principal of your mother's power of attorney would be your mother, and the principal of your father's power of attorney would be your father. If both parents are decease, then both of their powers of attorney are now invalid.
The real issue is what do your parents' wills say? And have those wills been admitted into probate. If your parents both wished for you to stay in the home, and their wills direct that the home shall pass to you, then you simply need to admit the wills to the appropriate probate court, go through the probate process, and then have the property deeded into your name.
If, however, the wills say that the home shall be given to you and your siblings in equal shares, then the story changes. If you and your siblings each own a fractional share (something less than 100% each), and you all cannot come to an agreement as to what to do with the house, then an action for quiet title may need to be filed so that a judge can decide what is fair and equitable.
My advice is to seek legal counsel from a probate attorney who practices law in the state and county in which the home is located. This attorney can explain your rights and the procedures to you depending on which state's laws apply.
The Power of Attorney terminates immediately at the point of death. The deceased estate is then controlled by the court appointed Personal Representative. Go see a probate attorney in your area who can quickly resolve your issues.
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My comments are not intended to establish an attorney-client relationship, are not confidential, and are not intended to constitute legal advice. Proper legal advice can only be given by an attorney who agrees to represent you, who reviews the facts of your specific case, who does not have a conflict of interest preventing the representation, and who is licensed as an attorney in the state where the law applies.
Dan W. Armstrong, Attorney
Law Offices of Dan W. Armstrong, P.A.
822 A1A North, Suite 303
Ponte Vedra Beach, FL 32082
(O) 904.280.0058, (F) 904.280.0109